70 
PEOFESSOE TYNDALL ON THE OPTICAL DEPOETMENT OF THE 
Infusion. Date of sealing. Appearance, Jan. 12. 
Mutton 
Nov. 12th 
Clear . . 
Cloudy. 
Fowl . 
55 55 
» • • 
Clear. 
Beef 
55 55 
„ . . 
Mycelium at bottom. 
Haddock 
55 55 
55 * * 
Clear. 
Sweetbread 
„ 16th 
55 * * 
Mycelium at bottom. 
Rabbit 
„ 13th 
55 
Clear. 
Heart 
55 55 
55 • • 
Curdy layer at top. 
Pheasant 
55 55 
55 * • 
Clear. 
Mullet 
55 55 
55 • • 
55 
Hare 
55 55 
55 
55 
Snipe 
55 55 
55 * • 
55 
Partridge 
55 55 
55 • • 
55 
Plover 
55 55 
55 
Mycelium below. 
Codfish 
55 55 
55 * * 
Clear. 
Kidney 
Jan. 5th 
55 • • 
Mycelium at bottom. 
Salmon 
Dec. 13 th 
55 • 
Clear. 
Whiting 
55 45 
55 • • 
55 
Turnip 
„ 29th 
55 • • 
55 
Hay ) 
Nov. 22nd 
(Clear with , 
j- Mycelium at bottom. 
4 drops of caustic potash) 
( sediment J 
Hay ) 
Clear . . 
Mycelium at bottom. 
2 drops of caustic potash) 
Hay | 
5 drops of caustic potash) 
55 55 
(Clear with ) 
l sediment ) 
> Clear. 
Hay | 
(Clear with ] 
i 
6 drops of caustic potash) 
55 55 
( sediment ) 
> ” 
Liver 
Nov. 30th 
Clear. 
Hay 
„ 18th 
55 
Clear. 
Hay 
55 55 
55 
55 
Turnip 
55 55 
55 • * 
Muddy. 
Thus, out of 31 flasks opened in the same air, 18 remained intact, while 13 were 
taken possession of by organisms — a fact obviously the same in character as that 
described by Pasteur. Such experiments demonstrate, if demonstration were needed, 
that it is not the air itself, or any gaseous or vaporous substance uniformly diffused 
through it, but some discontinuous substance floating in it, that is the cause of the 
infection. Instead of our tubes let us suppose thirty-one wounds to be opened in the 
same ward of a hospital ; plainly what has occurred with the tubes may occur with 
these wounds — some may receive the germs and putrefy, others may escape. Helped by 
the conception not only of germs, but of germ-clouds, the different behaviour of wounds 
